Surgical quality and nodal ultrastaging is associated with long-term disease-free survival in early colorectal cancer: an analysis of 2 international multicenter prospective trials - PubMed (original) (raw)
Clinical Trial
Surgical quality and nodal ultrastaging is associated with long-term disease-free survival in early colorectal cancer: an analysis of 2 international multicenter prospective trials
Anton Bilchik et al. Ann Surg. 2010 Sep.
Abstract
Background: The National Quality Forum has endorsed a minimum of 12 lymph node (LN) as a surrogate measure of quality in colorectal cancer (CRC). The prognostic value of ultrastaging hematoxylin and eosin (H&E) negative LNs (N0) using pan-cytokeratin immunohistochemistry (pan-CK-IHC) is unknown.
Purpose: To assess the effect on survival of surgical quality and focused pathologic analysis.
Patients and methods: Between 2001 and 2007, 253 evaluable patients with resectable CRC were enrolled. Multiple sectioning and pan-CK-IHC were performed on N0 LNs (American Joint Commission on Cancer Stage II). Follow-up was performed at 6-month intervals with a 4-year disease-free survival (DFS) primary end-point.
Results: There were 253 patients, 177 N0 and 76 N1/N2 patients, staged conventionally. Thirty-six (20%) N0 patients were upstaged using ultrastaging (N0-->N0i+ [n = 27] and N0-->N1mi [n = 9]). At a mean follow-up of 3.4 +/- 1.6 years, 38 (15%) have recurred. Only 3% (3/108) of patients with > or =12 LNs, negative by H&E and pan-CK-IHC (N0i-), compared with 18% (6/33) with <12 LNs/N0i- (6/33; P = 0.0015) have recurred. Four-year DFS differed significantly according to surgical quality (<12 vs. > or =12 LNs) among Stage II patients only (DFS, <12 vs. > or =12 LNs: Stage I, 90.5% vs. 97.7%, P = 0.22; Stage II, 67.5% vs. 94.7%, P = 0.0036; Stage III, 61% vs. 61%, P = 0.61).
Conclusion: This represents the first prospective report demonstrating that both surgical quality and nodal ultrastaging impacts survival in Stage II CRC. Patients with Stage II CRC having > or =12 LNs negative for micrometastases (N0i-) are likely cured by surgery alone. Both surgical and pathologic quality measures are imperative in early CRC to improve patient selection for adjuvant chemotherapy.
Figures
Figure 1
Ultra-staging of lymph nodes. Pan-CK-IHC analysis of H&E negative LN showing ITC's <0.2mm (N0i+).
Figure 2
Study population distribution of conventional staging and ultra-staging
Figure 3
Kaplan Meier DFS demonstrating difference between LN macrometastases (macro) N1/2, micrometastases (micro) N1mi, isolated tumor cells (ITCs) N0i+ and N0i- (H&E -/IHC-) p<0.001.
Figure 4
Kaplan Meier DFS of LN number and tumor volume. A large DFS difference is demonstrated in patients with ≥12 LN's negative for metastases (H&E -/IHC -; N0i-) vs. ≥ 12 LNs with metastases or <12LNs with or without metastases p<0.001.
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